When you need a lot of lighting in a compact fixture, choose a circline fluorescent bulb from Four-Bros. These lights are a popular choice for residential and commercial spaces and are available in various sizes. You can have a circline bulb with a diameter as small as 6 inches or as big as 16 inches, depending on your lighting needs and size of space. You can also choose from among various color options. See why so many people choose a circline bulb by buying one today. When searching, keep in mind that when paired with an electronic ballast, these lights can save 10 to 15 percent more energy.